Zhu Anquan, Zhang Jun, Guan Fengying, Tang Heming, Feng Xinjian
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
ACS Omega. 2019 Feb 18;4(2):3534-3538. doi: 10.1021/acsomega.8b03234. eCollection 2019 Feb 28.
Bioinspired superhydrophobic substrates have been used in many scientific and technological areas. These substrates can trap atmosphere-linked air pockets at the solid-liquid interface, offering an opportunity to address the oxygen-deficit problem in many reaction systems. Herein, we addressed the oxygen-deficit problem in metal oxide electrochemical deposition by using a triphase electrode possessing an air-liquid-solid joint interface. Oxygen in the interface is directly available from the air phase for sufficient OH production via oxygen cathodic reaction, thereby offering us a green approach to fabricate two-dimensional mesoporous ZnO nanoarrays over a wide range of current densities. Further, because metal oxides are deposited at the triphase interface, sufficient O, a natural electron scavenger required in photocatalytic reaction to suppress the recombination of photogenerated electron-hole pairs, can be directly supplied, and we demonstrated their enhanced photocatalytic reaction kinetics in water remediation. The present work highlights a powerful interface-engineering strategy for fabricating metal oxides with unprecedented photocatalytic ability.
受生物启发的超疏水基底已应用于许多科技领域。这些基底能够在固液界面捕获与大气相连的气穴，为解决许多反应体系中的缺氧问题提供了契机。在此，我们通过使用具有气-液-固联合界面的三相电极解决了金属氧化物电化学沉积中的缺氧问题。界面中的氧气可直接从气相获得，通过氧阴极反应产生足够的OH，从而为我们提供了一种在宽电流密度范围内制备二维介孔ZnO纳米阵列的绿色方法。此外，由于金属氧化物沉积在三相界面，光催化反应中抑制光生电子-空穴对复合所需的天然电子清除剂——充足的O可直接供应，并且我们证明了它们在水修复中具有增强的光催化反应动力学。目前的工作突出了一种强大的界面工程策略，用于制备具有前所未有的光催化能力的金属氧化物。
